Which operation is getting progressively more difficult? You say Cocking. Do you mean Closing the bolt, Lifting the bolt or Pulling Back the bolt? Please be specific on which operation.
Also, you said “disassembly/reassembly” of the Bolt resets it. I’m thinking something is being left out. Did start after initially doing something? Replacing a part? Or taking the bolt apart? There is always something left out.
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